Richard, the price of Stan's DACs is so low, relative to the antique you're using, that I'd seriously take a punt on one and relegate your De Capo to standby use.
I think Stan would fairly back me in this - modern DAC chips do most of it all internally now, so there's so much less for a designer to get wrong outside of this. Stan has worked hard to get the supply for his internals as immune as possible and this allows modern all-in-one chips to shine as they should. You just don't NEED a huge box full of 'stuff' these days as Marco and I have (the boards in my CD94 based Micro Seiki strike the fear of God in me, the wiring and circuit tracks involved and I know Marco's DAC box is even worse in this area, the great sound despite all this, rather than because of it)...
Go on, you know it makes sense to try it at least. My jury's out on hi-res right now as I'm getting very good 3-D and musical sounds without this 'luxury,' but some here like it and these people are almost certainly rather younger than I and without knackered hearing
Tear down these walls; Cut the ties that held me
Crying out at the top of my voice; Tell me now if you can hear me